apex

US /ˈeɪ.peks/
UK /ˈeɪ.peks/
"apex" picture
1.

the top or highest part of something, especially one forming a point

:
•
The climber reached the apex of the mountain.
•
The apex of the pyramid was gilded.
:
peaksummitpinnaclezenithacme
2.

the highest point of achievement or success; the climax

:
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His career reached its apex in the 1990s.
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The concert was the apex of the music festival.
:
climaxculminationzenithpinnaclepeak